/*
 * (c) Copyright 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package arq.examples;

// The ARQ application API.
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.sparql.util.IndentedWriter;
import com.hp.hpl.jena.vocabulary.DC;

/**
 * Example 1 : Execute a simple SELECT query on a model to find the DC titles
 * contained in a model.
 * 
 * @author Andy Seaborne
 */

public class Ex1 {
	static public final String NL = System.getProperty("line.separator");

	public static void main(String[] args) {
		// Create the data.
		// This wil be the background (unnamed) graph in the dataset.
		Model model = createModel();

		// First part or the query string
		String prolog = "PREFIX dc: <" + DC.getURI() + ">";

		// Query string.
		String queryString = prolog + NL
				+ "SELECT ?title WHERE {?x dc:title ?title}";

		Query query = QueryFactory.create(queryString);
		// Print with line numbers
		query.serialize(new IndentedWriter(System.out, true));
		System.out.println();

		// Create a single execution of this query, apply to a model
		// which is wrapped up as a Dataset

		QueryExecution qexec = QueryExecutionFactory.create(query, model);
		// Or QueryExecutionFactory.create(queryString, model) ;

		System.out.println("Titles: ");

		try {
			// Assumption: it's a SELECT query.
			ResultSet rs = qexec.execSelect();

			// The order of results is undefined.
			for (; rs.hasNext();) {
				QuerySolution rb = rs.nextSolution();

				// Get title - variable names do not include the '?' (or '$')
				RDFNode x = rb.get("title");

				// Check the type of the result value
				if (x.isLiteral()) {
					Literal titleStr = (Literal) x;
					System.out.println("    " + titleStr);
				} else
					System.out.println("Strange - not a literal: " + x);

			}
		} finally {
			// QueryExecution objects should be closed to free any system
			// resources
			qexec.close();
		}
	}

	public static Model createModel() {
		Model m = ModelFactory.createDefaultModel();

		Resource r1 = m.createResource("http://example.org/book#1");
		Resource r2 = m.createResource("http://example.org/book#2");

		r1.addProperty(DC.title, "SPARQL - the book").addProperty(
				DC.description, "A book about SPARQL");

		r2.addProperty(DC.title, "Advanced techniques for SPARQL");

		return m;
	}
}

/*
 * (c) Copyright 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. The name of the author may not
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */